Recent content by itstallion

Thanks for your assistance Duke and Louis.

Yeah the only thing exhibiting heat is the PCH. My power supply showed .356 amps being used by the PCH. I applied some heat to the PCH and the usage went up well above an amp. I checked for voltage drop from pin 2 of L7614 with the PCH heated up and it showed .000. I'm calling this a PCH.

Ok went back and resoldered. Back to where I started. No LED #2, .007 v on PP1V05_S0. Now what? inject power on L7614 pin 2 side and see what get's hot?

Ok so I replaced U7600 and I now have Led #2 but no boot no chime still. I do have fan spin now. Voltage on PP1V05_S0 is reading .390 v now. Reading .006 v drop from L7614 pin 2 to ground. Time to inject some power and see what get's hot? I've also replaced C7607 and 7608 with new ones. I went...

Yeah I'm getting neither of those with the video card installed or uninstalled. Since the PP1V05 seems to be missiing and that's killing the PCH what's the next step I should take. I've been checking all the components around that regulator. Start swapping with known good components?

And U7000 Pin 14 = 3.305 Pin 13 = 3.302 Pin 12 = 0 Pin 11 = 0 Pin 10 =3.302 Pin 9 = 0 Pin 8 = 0 Pin 7 = 0 Pin 6 = 3.305 Pin 5 = 3.302 Pin 4 = 3.304 Pin 3 = 0 Pin 2 = 0 Pin 1 = 3.305

Video card installed. Here's what I saw on U6900 Pin 14 = 3.306 Pin 13 = 0 Pin 12 = .023 video card uinstalled = 3.303 all other pins stayed the same Pin 11 = 0 Pin 10 = 3.285 Pin 9 = 3.302 Pin 8 = 3.306 Pin 7 = 0 Pin 6 = 0 Pin 5 = 0 Pin 4 = 0 Pin 3 = 3.306 Pin 2 = 3.304 Pin 1 = 3.294

Yeah unfortunately I don't have a known good video card to swap out with. I did pull the video card and observe the same behavior.

Yeah I saw your video the other day on that. no light on my mouse. I've checked for an enable signal on the 1.05v reg and I've also checked for 5v and 12v going to it. They're all there.

Hi I've got an 820-2784-A out of a mid 2011 21.5 iMac. Only have #1 LED lit. hitting the power button spins up the hdd but no video, no chime, no fans. I've checked all S5 rails they are there. Checked all S3 rails they are there. I've checked all S0 Rails and the only discrepancy I'm...